<template>
    <div>
        <!-- 面包屑导航区 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>权限管理</el-breadcrumb-item>
            <el-breadcrumb-item>角色列表</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片视图 -->
        <el-card>
            <!-- 添加角色按钮区域 -->
            <el-row>
                <el-col>
                    <el-button type="primary" @click="addDialogVisible=true">添加角色</el-button>
                </el-col>
            </el-row>

            <!-- 角色列表区域 -->
            <el-table :data="rolelist" border stripe>
                <!-- 展开列 -->
                <el-table-column type="expand">
                    <template slot-scope="scope">
                        <el-row :class="['bdbottom', i1 === 0 ? 'bdtop' : '', 'vcenter']" v-for="(item1, i1) in scope.row.children" :key="item1.id">
                            <!-- 渲染一级权限 -->
                            <el-col span="5">
                                <el-tag closable @close="removeRightById(scope.row, item1.id)">{{item1.authName}}</el-tag>
                                <i class="el-icon-caret-right"></i>
                            </el-col>
                            <!-- 渲染二级和三级权限 -->
                            <el-col span="19">
                                <!-- 通过 for 循环嵌套渲染二级权限 -->
                                <el-row :class="[i2 === 0 ? '' : 'bdtop', 'vcenter']" v-for="(item2, i2) in item1.children" :key="item2.id">
                                    <el-col :span="6">
                                        <el-tag type="success" closable @close="removeRightById(scope.row, item2.id)">{{item2.authName}}</el-tag>
                                        <i class="el-icon-caret-right"></i>
                                    </el-col>
                                    <el-col :span="18">
                                        <el-tag v-for="(item3) in item2.children" :key="item3.id" closable @close="removeRightById(scope.row, item3.id)">{{item3.authName}}</el-tag>
                                    </el-col>
                                </el-row>
                            </el-col>
                        </el-row>
                    </template>
                </el-table-column>
                <!-- 索引列 -->
                <el-table-column type="index"></el-table-column>
                <el-table-column label="角色名称" prop="roleName"></el-table-column>
                <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
                <el-table-column label="操作" width="300px">
                    <template slot-scope="scope">
                        <!-- 编辑 -->
                        <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.id)">编辑</el-button>
                        <!-- 删除 -->
                        <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeRoleById(scope.row.id)">删除</el-button>
                        <!-- 分配权限 -->
                        <el-button size="mini" type="warning" icon="el-icon-setting" @click="showSetRightDialog(scope.row)">分配权限</el-button>
                    </template>
                </el-table-column>
            </el-table>
        </el-card>

        <!-- 添加角色的对话框 -->
        <el-dialog
            title="添加角色"
            :visible.sync="addDialogVisible"
            width="50%"
            @close="addDialogClosed">
            <!-- 内容主体区 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="80px">
                <el-form-item label="角色名称" prop="roleName">
                    <el-input v-model="addForm.roleName"></el-input>
                </el-form-item>
                <el-form-item label="角色描述" prop="roleDesc">
                    <el-input v-model="addForm.roleDesc"></el-input>
                </el-form-item>
            </el-form>
            <!-- 底部 -->
            <span slot="footer" class="dialog-footer">
                <el-button @click="addDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addRole">确 定</el-button>
            </span>
        </el-dialog>

        <!-- 编辑角色的对话框 -->
        <el-dialog
            title="编辑角色"
            :visible.sync="editDialogVisible"
            width="50%"
            @close="editDialogClosed">
            <el-form :model="editForm" :rules="addFormRules" ref="editFormRef" label-width="80px">
                <el-form-item label="角色名称" prop="roleName">
                    <el-input v-model="editForm.roleName"></el-input>
                </el-form-item>
                <el-form-item label="角色描述" prop="roleDesc">
                    <el-input v-model="editForm.roleDesc"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="editDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="editRoleInfo">确 定</el-button>
            </span>
        </el-dialog>

        <!-- 分配权限的对话框 -->
        <el-dialog
            title="分配权限"
            :visible.sync="setRightDialogVisible"
            width="50%"
            @close="setRightDialogClosed">
                <!-- 树形控件 -->
                <el-tree :data="rightslist" :props="treeProps" 
                    show-checkbox node-key="id" default-expand-all
                    :default-checked-keys="defKeys"
                    ref="treeRef"></el-tree>
                <span slot="footer" class="dialog-footer">
                    <el-button @click="setRightDialogVisible = false">取 消</el-button>
                    <el-button type="primary" @click="allotRights">确 定</el-button>
                </span>
        </el-dialog>
    </div>
</template>

<script>
    export default {
        name: 'VueShopRoles',

        data() {
            return {
                // 所有角色列表数据
                rolelist: [],
                // 控制添加角色对话框的显示与隐藏
                addDialogVisible: false,
                // 添加角色的表单数据
                addForm: {
                    roleName : '',
                    roleDesc : ''
                },
                // 添加和编辑表单的验证规则对象
                addFormRules: {
                    roleName: [
                        { required: true, message: '请输入角色名称', trigger: 'blur'},
                        { min: 3, max: 10, message: '角色名称长度在3~10个字符之间', trigger: 'blur'}
                    ],
                    roleDesc: [
                        { required: false, message: '请输入角色描述', trigger: 'blur'}
                    ]
                },
                // 控制编辑角色对话框的显示与隐藏
                editDialogVisible: false,
                // 查询到的角色信息对象
                editForm: {},
                // 控制分配权限对话框的显示与隐藏
                setRightDialogVisible: false,
                // 所有权限的数据
                rightslist: [],
                // 树形控件的属性绑定对象
                treeProps:{
                    label:'authName',
                    children:'children'
                },
                // 默认选中的节点Id值数组
                defKeys:[],
                // 当前即将分配权限的角色Id
                roleId: ''
            };
        },

        created(){
            this.getRolesList()
        },

        mounted() {
            
        },

        methods: {
            // 获取所有角色列表
            async getRolesList(){
                const {data: res} = await this.$http.get('roles')

                if(res.meta.status !== 200){
                    return this.$message.error('获取角色列表失败！')
                }
                this.rolelist = res.data
            },
            // 监听添加角色对话框的关闭事件
            addDialogClosed(){
                this.$refs.addFormRef.resetFields()
            },
            // 点击按钮，添加新角色
            addRole(){
                this.$refs.addFormRef.validate(async valid => {
                    if(!valid) return
                    // 可以发起添加角色的网络请求
                    const{data: res} = await this.$http.post('roles', this.addForm)
                    if(res.meta.status !== 201){
                        this.$message.error('添加角色失败！')
                    }
                    this.$message.success('添加角色成功！')
                    // 隐藏添加角色的对话框
                    this.addDialogVisible = false
                    // 重新获取角色列表
                    this.getRolesList()
                })
            },
            // 展示编辑角色的对话框
            async showEditDialog(id){
                const {data: res } = await this.$http.get('roles/' + id)
                if(res.meta.status !== 200){
                    return this.$message.error('查询角色信息失败！')
                }
                this.editForm = res.data
                this.editDialogVisible = true
            },
            // 监听编辑角色对话框的关闭事件
            editDialogClosed(){
                this.$refs.editFormRef.resetFields()
            },
            // 编辑角色信息并提交
            editRoleInfo(){
                this.$refs.editFormRef.validate(async valid => {
                    if(!valid) return
                    // 发起修改角色信息的数据请求
                    const {data: res} = await this.$http.put('roles/' + this.editForm.roleId,{
                        roleName : this.editForm.roleName ,
                        roleDesc : this.editForm.roleDesc 
                    })
                    if(res.meta.status !== 200){
                        return this.$message.error('更新角色信息失败！')
                    }
                    // 关闭对话框
                    this.editDialogVisible = false
                    // 刷新数据列表
                    this.getRolesList()
                    // 提示修改成功
                    this.$message.success('更新角色信息成功！')
                })
            },
            // 根据id删除对应的角色信息
            async removeRoleById(id){
                // 询问是否删除数据
                const confirmResult = await this.$confirm('此操作将永久删除该角色, 是否继续?', '提示', {
                    confirmButtonText: '确定',
                    cancelButtonText: '取消',
                    type: 'warning'
                }).catch(err => err)
                // 如果角色确认删除，则返回值为字符串confirm
                // 如果角色取消删除，则返回值为字符串cancel
                if(confirmResult !== 'confirm'){
                    return this.$message.info('已取消删除')
                }
                const {data: res} = await this.$http.delete('roles/' + id)
                if(res.meta.status !== 200){
                    return this.$message.error('删除角色失败！')
                }
                this.$message.success('删除角色成功！')
                this.getRolesList()
            },
            // 根据Id删除对应的权限
            async removeRightById(role, rightId){
                // 弹框提示用户是否要删除
                const confirmResult = await this.$confirm('此操作将永久删除该权限, 是否继续?', '提示', {
                    confirmButtonText: '确定',
                    cancelButtonText: '取消',
                    type: 'warning'
                }).catch(err => err)

                if(confirmResult !== 'confirm'){
                    return this.$message.info('取消了删除！')
                }
                const {data: res} = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)
                if(res.meta.status !== 200){
                    return this.$message.error('删除权限失败！')
                }
                // this.getRolesList()
                role.children = res.data
            },
            // 展示分配权限的对话框
            async showSetRightDialog(role){
                this.roleId = role.id
                // 获取所有权限数据
                const {data: res} = await this.$http.get('rights/tree')
                if(res.meta.status !== 200){
                    return this.$message.error('获取权限数据失败！')
                }
                // 把获取到的权限数据保存到data中
                this.rightslist = res.data
                // 递归获取三级节点的id
                this.getLeafKeys(role, this.defKeys)

                this.setRightDialogVisible = true
            },
            // 通过递归的形式，获取角色下所有的三级权限的id，并保存到defKeys数组中
            getLeafKeys(node, arr){
                // 如果当前node节点不包含children属性，则是三级节点
                if(!node.children){
                    return arr.push(node.id)
                }
                node.children.forEach(item =>
                this.getLeafKeys(item, arr))
            },
            // 监听分配权限对话框的关闭事件
            setRightDialogClosed(){
                this.defKeys = []
            },
            // 点击为角色分配权限
            async allotRights(){
                const keys = [
                    ...this.$refs.treeRef.getCheckedKeys(),
                    ...this.$refs.treeRef.getHalfCheckedKeys()
                ]
                const idStr = keys.join(',')
                const{data: res} = await this.$http.post(`roles/${this.roleId}/rights`, {rids: idStr})
                if(res.meta.status !== 200){
                    return this.$message.error('分配权限失败！')
                }
                this.$message.success('分配权限成功！')
                this.getRolesList()
                this.setRightDialogVisible = false
            }
        },
    };
</script>

<style lang="less" scoped>
    .el-tag{
        margin: 7px;
    }
    .bdtop{
        border-top: 1px solid #eee;
    }
    .bdbottom{
        border-bottom: 1px solid #eee;
    }
    .vcenter{
        display: flex;
        align-items: center;
    }
</style>